POST UTME OSUSTECH 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2.0 g sample of a compound containing only carbon and hydrogen is burned in oxygen to produce 3.2 g of CO2 and 1.0 g of H2O. What is the empirical formula of the compound?
A. CH_4
B. C_2H_6
C. C_3H_8
D. C_4H_{10}
Question 2
In the cell cycle, what is the primary function of the G2 phase?
A. DNA replication
B. Mitosis
C. Interphase
D. Synthesis of organelles
Question 3
A bacterium has a mutation that causes it to produce a toxin that is lethal to humans. If the bacterium has a doubling time of 30 minutes and a population growth rate of 0.5 per hour, what is the population size after 2 hours?
A. 1.6 x 10^6
B. 3.2 x 10^6
C. 6.4 x 10^6
D. 12.8 x 10^6
Question 4
The process by which the body gets rid of waste products and excess subs\tances is called
A. Excretion
B. Osmoregulation
C. Respiration
D. Photosynthesis
Question 5
A plant has a genotype of BBRR. If the plant is crossed with a plant having the genotype bbrr, what is the probability that the offspring will have the genotype BbRr?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 6
A diagram of the human eye is shown below. What is the function of the structure labeled 'Y'?
A. B\ending of light rays
B. Detection of light
C. Regulation of light entry
D. Focus of light
E. Transmission of visual signals
Question 7
A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If a random sample of 50 individuals is taken, what is the probability that the sample mean height is greater than 175 cm?
A. 0.05
B. 0.01
C. 0.005
D. 0.0005
Question 8
In a population of E. coli bacteria, the average generation time is 30 minutes. If the initial population size is 10^6 cells, what is the population size after 4 hours?
A. 10^8
B. 10^7
C. 10^6
D. 10^5
Question 9
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' for black eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'B'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2
Question 10
What is the primary difference between asexual and sexual reproduction in plants?
A. Asexual reproduction involves the production of seeds, while sexual reproduction involves the production of spores
B. Asexual reproduction involves the fusion of gametes, while sexual reproduction involves the production of offspring without gametes
C. Asexual reproduction involves the production of offspring with genetic variation, while sexual reproduction involves the production of offspring with no genetic variation
D. Asexual reproduction involves the production of offspring with a mix of parental traits, while sexual reproduction involves the production of offspring with a \single parental trait
Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, calculate the number of individuals that are homozygous recessive.
A. 180
B. 200
C. 220
D. 240
Question 12
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number and kind of chromosomes as the parent cell, is called
A. Mitosis
B. Meiosis
C. Binary Fission
D. Endosymbiosis
Question 13
What is the primary function of the pituitary gland in the human body?
A. To produce hormones to regulate growth and development
B. To produce hormones to regulate metabolism and energy balance
C. To produce hormones to regulate reproductive functions
D. To produce hormones to regulate blood pressure and fluid balance
Question 14
A cell is placed in a solution with a pH of 5.5. If the cell membrane has a permeability coefficient of 1.2 x 10^-6 cm/s, what is the concentration of hydrogen ions in the cell after 10 minutes?
A. 1.2 x 10^-5 M
B. 2.4 x 10^-5 M
C. 3.6 x 10^-5 M
D. 4.8 x 10^-5 M
Question 15
The process by which plants make their own food from sunlight, water, and carbon dioxide is called
A. Respiration
B. Photosynthesis
C. Transpiration
D. Osmosis

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